generally decreased the fair value of investment securities) during the period from March 31, 2023 through September 30, 2023. In the three months ended December 31, 2023, intermediate-term market interest rates decreased significantly (which once again generally increased the fair value of investment securities).
In addition, included in stockholders’ equity at December 31, 2023, were realized gains (net of taxes) on the Company’s cash flow hedge (interest rate swap), which was terminated in March 2020, totaling $11.1 million. This amount, plus associated deferred taxes, is expected to be accreted to interest income over the remaining term of the original interest rate swap contract, which was to end in October 2025. At December 31, 2023, the remaining pre-tax amount to be recorded in interest income was $14.4 million. The net effect on total stockholders’ equity over time will be no impact as the reduction of this realized gain will be offset by an increase in retained earnings (as the interest income flows through pre-tax income).
Also included in stockholders’ equity at December 31, 2023, were unrealized losses (net of taxes) on the Company’s three outstanding cash flow hedges (three interest rate swaps) totaling $13.0 million. Significant increases in market interest rates since the inception of these hedges have caused their fair values to decrease; however, market interest rates decreased in the three months ended December 31, 2023, causing the fair values of these swaps to increase in that period.
As noted above, total stockholders’ equity increased $38.7 million, from $533.1 million at December 31, 2022 to $571.8 million at December 31, 2023. Stockholders’ equity increased due to the Company recording net income of $67.8 million for the year ended December 31, 2023 and increased by $2.5 million due to stock option exercises during 2023. AOCI (loss) decreased $10.9 million (increase to stockholders’ equity) during the year ended December 31, 2023, primarily due to changes in the market value of available-for-sale securities and changes in the fair value of cash flow hedges. Partially offsetting these increases were repurchases of the Company’s common stock totaling $23.3 million and dividends declared on common stock of $19.1 million.
The Company also had unrealized losses on its portfolio of held-to-maturity investment securities, which totaled $23.8 million at December 31, 2023, that were not included in its total capital balance. If these held-to-maturity unrealized losses were included in capital (net of taxes), this would have decreased total stockholder’s equity by $18.0 million at December 31, 2023. This amount was equal to 3.1% of total stockholders’ equity of $571.8 million at that date.
Banks are required to maintain minimum risk-based capital ratios. These ratios compare capital, as defined by the risk-based regulations, to assets adjusted for their relative risk as defined by the regulations. Under current guidelines, which became effective January 1, 2015, banks must have a minimum common equity Tier 1 capital ratio of 4.50%, a minimum Tier 1 risk-based capital ratio of 6.00%, a minimum total risk-based capital ratio of 8.00%, and a minimum Tier 1 leverage ratio of 4.00%. To be considered “well capitalized,” banks must have a minimum common equity Tier 1 capital ratio of 6.50%, a minimum Tier 1 risk-based capital ratio of 8.00%, a minimum total risk-based capital ratio of 10.00%, and a minimum Tier 1 leverage ratio of 5.00%. On December 31, 2023, the Bank’s common equity Tier 1 capital ratio was 13.1%, its Tier 1 capital ratio was 13.1%, its total capital ratio was 14.3% and its Tier 1 leverage ratio was 11.6%. As a result, as of December 31, 2023, the Bank was well capitalized, with capital ratios in excess of those required to qualify as such. On December 31, 2022, the Bank’s common equity Tier 1 capital ratio was 11.9%, its Tier 1 capital ratio was 11.9%, its total capital ratio was 13.1% and its Tier 1 leverage ratio was 11.5%. As a result, as of December 31, 2022, the Bank was well capitalized, with capital ratios in excess of those required to qualify as such.
The FRB has established capital regulations for bank holding companies that generally parallel the capital regulations for banks. On December 31, 2023, the Company’s common equity Tier 1 capital ratio was 11.9%, its Tier 1 capital ratio was 12.4%, its total capital ratio was 15.2% and its Tier 1 leverage ratio was 11.0%. On December 31, 2022, the Company’s common equity Tier 1 capital ratio was 10.6%, its Tier 1 capital ratio was 11.0%, its total capital ratio was 13.5% and its Tier 1 leverage ratio was 10.6%.
In addition to the minimum common equity Tier 1 capital ratio, Tier 1 risk-based capital ratio and total risk-based capital ratio, the Company and the Bank have to maintain a capital conservation buffer consisting of additional common equity Tier 1 capital greater than 2.5% of risk-weighted assets above the required minimum levels in order to avoid limitations on paying dividends, repurchasing shares, and paying discretionary bonuses. Both the Company and the Bank had a capital conservation buffer that exceeded the required minimum levels at December 31, 2023 and 2022.
Dividends. During the year ended December 31, 2023, the Company declared common stock cash dividends of $1.60 per share (28.5% of net income per common share) and paid common stock cash dividends of $1.60 per share. During the year ended December 31, 2022, the Company declared common stock cash dividends of $1.56 per share (25.9% of net income per common share) and paid